The stls from CadQuery and OpenSCAD are not compressed and so we're
throwing away bandwidth and taking a performance hit by not gziping.
Gzip for s3 basically needs to be gziped before upload and than have
'content-type' : 'text/stl'
'content-encoding' : 'gzip'
set.
https://stackoverflow.com/questions/8080824/how-to-serve-gzipped-assets-from-amazon-s3
The obvious part that needs to change is putObject in
app/api/src/docker/common/utils.js but there might be a few more
nuances.
resolves#391
